Apparatus for applying adhesive



June 14, 1966 MAWBEY APPARATUS FOR APPLYING ADHESIVE 5 Sheets-Sheet 1 Filed March 28, 1963 Inventor Lawrence Mall/[783 B5 hzs Attorney filflwfl f 'wl/ June 14, 1966 L. MAWBEY APPARATUS FOR APPLYING ADHESIVE 3 Sheets-Sheet 2 Filed March 28, 1963 June 14, 1966 MAWBEY 3,255,728

APPARATUS FOR APPLYING ADHESIVE Filed March 28, 1963 5 Sheets-Sheet 3 United States Patent 3,255,728 APPARATUS FOR APPLYING ADHESIVE Lawrence Mawbey, Leicester, England, assignor to United Shoe Machinery Corporation, Flemington, N.J., a corporation of New Jersey Filed Mar. 28, 1963, Ser. No. 268,727 Claims priority, application Great Britain, May 8, 1962, 17,581/ 62 16 Claims. (Cl. 118-202) The present invention is'concerned with improvements in or relating to apparatus adapted for use in applying adhesive composition, and is herein illustrated as embodied in apparatus of the type in which an applying blade is adapted to pick up adhesive from a supply roll and apply the adhesive to a work piece as a band extending transversely thereof.

When applying thermoplastic adhesive compositions to a work piece it has been common to use an apparatus comprising an applying blade which is moved into contact with a supply roll, having a continuous film of molten adhesive composition thereon, to pick up adhesive composition from the roll and to apply it to the work piece. An apparatus operating in this manner is described in British Patent No. 896,291, published May 16, 1962.

It is often desirable in such an apparatus to vary the tion applied by the blade by varying the thickness of the film of adhesive on the supply roll. However not only is it difiicult to obtain any very wide variation in the thickness of the film of adhesive composition on the supply roll, but also it is found that, presumably owing to the viscosity of the adhesive composition, composition is dragged back off the blade as it leaves the film of adhesive on the roll, and consequently the increase in adhesive composition on the blade is not commensurate with increase of thickness of film, in fact there appears to be, with any particular blade, an upper limit to the quantity of adhesive that can be picked off the roll. It is, therefore, an object of the present invention to provide an improved apparatus of the aforementioned type adapted for use in applying adhesive composition in which the quantity of adhesive composition applied can be readily regulated.

With this object in view and in accordance with features of the invention, in the 'herein illustrated apparatus, the supply roll, which is mounted in a block provided with a chamber for rotation with its curved surface in contact with molten adhesive composition in the chamber, has formed in its curved surface three, circumferentially equally spaced, similar recesses each extending the length of the roll parallel to the axis of the roll. These recesses are formed radially about an axis distant from the axis of the roll a distance very slightly greater than the distance between the axis of the roll and the axis of revolution of the applying blade. Mounted in the block are two bars, each of which is in contact with curved surface of the roll, and the chamber is formed between the block and the roll and has end portions closed by end plates secured to the block and is closed longitudinally by the two bars;

As the roll rotates in the operation of the illustrative apparatus an upper one of the two bars wipes adhesive composition oflf the curved surface of the roll while allowing the recesses to be filled with adhesive composition.

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The adhesive applying blade and the supply roll are driven by mechanism, including interconnected gears, in such a manner that the supply roll makes one rotation to three revolutions of the applying blade. As the applying blade revolves it approaches the supply roll and enters one of the recesses adjacent an entry edge thereof. Preferably the blade has, at the point of contact, a velocity considerably greater than that of the surface of the roll, and the blade thus moves through the recess, sweeping out a quantity of adhesive composition from the recess. Moreover, the blade is spring loaded and is so arranged that it does at least reach an exit edge of the recess. At the exit edge there is a boundary between adhesive composition in the recess and the curved surface of the roll, which is clean of adhesive composition. The blade as it passes over the exit edge thus gathers up adhesive composition collected in its passage through the recess and takes it cleanly off the roll, there being little if any tendency for adhesive composition to be dragged back 0d the blade as the blade leaves the roll.

To provide for varying the amount of adhesive picked up by the blade, the following arrangement is provided in accordance with still another feature of the invention.

The quantity of adhesive composition gathered in any one revolution by the applying blade may be regulated by varying the angular relation between the supply roll and the applying blade. 'Thus, if the blade is arranged to enter the recess substantially at the entry edge of the recess the blade collects almost all the adhesive composition in the recess. If it is arranged to enter the recess at some point nearer the exit edge it collects corresponding less adhesive composition. Accordingly means are provided in the driving mechanism for varying this angular relationship.

The above and other of the various objects and features of the present invention will become more clear from the following description, to be read with reference to the accompanying drawings, of an illustrative apparatus and will be pointed out in the claims.

In the accompanying drawings,

FIG. 1 shows a front view of the illustrative apparatus, showing a supply device and a supply roll thereof;

FIG. 2 shows a side view of part of the illustrative apparatus, showing the relationship between a folding roll, the supply roll and an adhesive applying device of the illustrative apparatus;

FIG. 3 shows a view in section through the supply roll and the adhesive applying device taken generally along the lines III-III in FIGS. 1 and 6 and looking in the direction of the arrows;

FIGS. 4 and 5 are diagrammatic views illustrating the cooperation of the supply roll and an adhesive applying blade; 1

FIG. 6 is a view, largely in section along the line VIVI of FIG. 3, of the adhesive applying device; and

FIG. 7 is a view in section along the line VIIVII of FIG. 6 and looking in the direction of the arrows.

The illustrative apparatus comprises a supply device indicated generally by the reference character 2 (FIG. 1) which is supplied with a rod R of thermoplastic adhesive composition and is arranged to melt the rod and to supply molten thermoplastic adhesive composition, when the apparatus is in operation, to a chamber 4 (FIG. 3), a generally cylindrical supply roll 6 which is arranged to rotate about its axis with its curved surface 8 (FIG. 3) in contact with adhesive composition in the chamber 4,

and an adhesive applying device indicated generally by reference character (FIGS. 3 and 6) comprising an adhesive applying blade 12 which extends generally parallel to the axis of the supply roll 6, and which rotates about an axis 14 parallel to that of the roll, the blade 12 in its rotation picking up adhesive composition from the supply roll 6 and applying it to a work piece fed in the direction of the arrow 16 (FIG. 2).

The supply device 2 comprises a melting unit 18 and a rod feeding unit 20. The melting unit 18 comprises a block 22 in which is mounted a melt wheel 24, on a shaft 26 and, in the operation of the illustrative apparatus, rotated anticlockwise (viewing FIG. 1). A passage 28 is provided in the block 22 and extends from the rod feeding unit 20, nearly twice around the wheel 24 and then downwardly to a passage 45 in a block 44 which passage 45 leads to the chamber 4. The rod feeding unit comprises two feed wheels 30, 32 arranged on opposite sides of a tubular guide 34 through which the rod R passes. The wheel is mounted on a pivoted arm 36. The feeding unit 20 also comprises a rod clamping device 38 which is operated by a solenoid 120.

In the operation of the illustrative apparatus the block 22 is heated by electrical elements (not shown), and the melt wheel 24 is caused to rotate by a suitable source of power (not shown). The feed wheels 30 and 32 are also rotated from the same power source to feed the rod R into a passage 122 which leads to the passage 28 of the pump unit 18. As rod R passes through the passage 28 it is progressively melted, and molten adhesive composition is pumped by the action of the wheel 24 through the passage 28 to the passage and thence, via a transverse passage 47 and feed passages 49, into the chamber 4. The illustrative apparatus comprises a bellows device indicated generally by reference character 51 which is in communication with the chamber 4, and when pressure of adhesive composition in the chamber 4 exceeds a certain value the bellows device operates a microswitch (not shown) which actuates the solenoid 120. Actuation of the solenoid 120 causes the clamping device 38 to clamp the rod R and also the arm 36 to move to carry the wheel 30 out of contact with the rod R. Thus no further rod is fed into the passage 122, although rotation of the wheel 24 is continued to maintain supply of adhesive composition to the chamber 4, the bellows device functioning generally in the same manner as the vane 132 of the apparatus disclosed in United States Letters Patent No. 2,787,241, issued April 2, 1957, in the name of John S. Kelley.

The supply roll 6 is mounted for rotation in the block 44 with its curved surface 8 in contact with molten adhesive composition in the chamber 4. The left hand end portion of the roll 6 FIG. 1, has a bore formed in it comprising a portion 124 of smaller diameter and a portion 125 of larger diameter. A pin 128 having a collar 130 is fitted into the bore, the collar abutting against a shoulder formed where the portions 124 and 125 join and one end portion of the pin fitting tightly into the portion 124. Positioned on the pin and abutting against the collar 130 is a sealing washer 200. A bearing sleeve 202 extends through an end plate 136, which is secured to the block 44, around the pin 128 and abuts against the washer 200. A roller bearing 204 on an end portion of the pin 128 is fitted into the sleeve 202, and a spring 206 acts between the bearing 204 and two polytetrafluorethylene washers 208, urging the washers against a retaining collar 210 formed in the sleeve 202. A cap 212 secured to the end plate 136 holds the sleeve 202 firmly in position. This arrangement at the left hand end of the roll 6 serves to minimize the likelihood of molten adhesive composition percolating through to the roller bearing 204. The right hand end portion of the roll 6 is supported in a similar fashion to the left hand end portion, comprising a double diameter bore 126 in which a pin 214, resembling the pin 128, is secured. The details of the bearings and seals surrounding the pin 214 are not shown. The pin 214 has an extension 216 which extends through an end plate 138 secured to the block 44 to a coupling 218.

Formed in the curved surface 8 of the roll 6 are three, circumferentially equally spaced, similar recesses 42, each extending the length of the roll 6 parallel to the axis of the roll. These recesses 42 are formed radially about an axis distant from the axis of the roll 6 a distance very slightly greater than the distance between the axis 14 and the axis of the roll 6 (FIG. 3). Mounted in the block 44 are two bars 46, 48 each of which is in contact with the curved surface 8 of the roll 6. The chamber 4 is formed between the block 44 and the roll 6 and has end portions closed by the end plates 136, 138 and is closed longitudinally by the bars 46 and 48. In the operation of the illustrative apparatus the roll 6 rotates anticlockwise (viewing FIG. 3) and the bar 46 wipes adhesive composition off the curved surface 8 of the roll as it moves past the bar 46, while allowing the recesses 42 to be filled with adhesive composition. The bar 48 prevents adhesive composition from running out from the chamber 4.

The applying device 10 of the illustrative apparatus comprises the adhesive applying blade 12 and a folding blade 50, and is mounted to rotate clockwise (viewing FIGS. 2 and 3). In the operation of the illustrative apparatus a tubular bag blank 52 is fed to a folding roll 54 (diagrammatically shown in FIG. 2) and a folding blade 50 cooperates with a recess 56 in the roll to fold an end portion of the bag blank into the recess, leaving an upstanding end portion 58. The applying blade 12 then applies a stripe of adhesive composition to the bag blank, and further mechanism (not shown) wipes the upstanding portion 58 of the blank onto the stripe of adhesive composition.

The illustrative apparatus comprises two side frame members 60, 62 between which the applying device 10 is mounted. A boss 64 is secured in the member 60, and a shaft 66 is mounted for rotation in a bearing 68 in the boss 64 and a bearing 70 in the frame member 62. Secured on an end portion of the shaft 66 extending outside the frame member 62 is a gear wheel 72 by which the shaft may be driven. A stationary eccentric cam 74 is fixed to the boss 64 and surrounds a bearing 76, in which the shaft 66 runs. Another stationary eccentric cam 78 is secured to the frame member 62 and surrounds a bearing 80, in which the shaft 66 runs. Fixed to the shaft 66 are two supporting discs 86, 88 each of which is split radially (see FIG. 7) to provide for the securing of the folding blade 50 by screws 90, 92. The disc 88 is provided with two arcuate apertures 94, 96 (FIG. 7), the disc 86 comprises two similar arcuate apertures (not shown).

Mounted for rotation on a bearing 82 on the cam 74 is a cap member 98. Mounted for rotation on a bearing 84 on the cam 78 is a cap member 100. A supporting member 102 is supported between the cap members 98 and 100. The member 102 comprises a central portion 104 of generally cylindrical outside configuration and of a wall thickness which varies radially, web portions 106, 108 which extend from either end of the central portion 104 and support lugs 110, 112 respectively. The web portions 106, 108 are arranged to pass through the apertures in the discs 86 and 88 respectively, and the lugs 110, 112 are secured to the cap members 98 and respectively by screws (not shown). Formed in the central portion 104 of the member 102 are two sets of opposed radial bores 114, 116 (see FIG. 3). Bolts 118 passing through the shaft 66 and the bores 116 support the folding blade 50. Formed on the central portion 104 of the supporting member 102 are two lugs and 142, and pins 146, 148 slidably movable in these lugs comprise blocks 156, 158 by which they are pivoted to a member 150 which supports the adhesive applying blade 12. Springs 152, 154 around the pins 146, 148 act between the lugs 140, 142 and the blocks 156, 158 to urge 5. the member 150 downwards (viewing FIG. 6). A guide plate 164 secured to the supporting member 102 by screws 166 overlie the member 158. The cap member 100 is provided with a gear portion 168. i

In. the operation of the illustrative apparatus gears driven by a motor (not shown) drive the gear wheel 72 and the gear portion 168 at the same speed to rotate the folding blade 58 and the applying blade 12. The folding blade 50 moves in a circular path A about the axis of the shaft 66 (see FIG. 3). The applying blade 12 moves in a circular path B about the offset parallel axis 14, the cams 74 and 78 determining the path of the blade 12.

A bore 188 is provided on a left hand end portion (viewing FIG. 6) of the shaft 66. The shaft comprises a reduced end portion 196 and a shoulder 191, and secured on the shaft by a nut 192 between the nut and the shoulder 191 are an insulating disc 193, a brass bush 194, an insulating disc 195, a second brass bush 196 and an insulating disc197. The discs and bushes are prevented from rotating relative to each other by pins 198. Leads 199, 201 are led from the bushes 194, 196 through the shaft 66 to a heating element 203 mounted in the applying blade 12 (see FIG. 3).

Secured to the shaft 66 is a gear 144 which meshes .with a gear 170 (FIG. 2) having three radial slots 172, 172, 172 and secured by bolts 186, 186, 186 passing through these slots to a-disc 174 positioned in a countersink in the gear 170. The disc 174- is secured to a shaft 176 which is mounted for rotation in the side frame member 60. Secured to the boss 64 by screws 178, 180 is a V-shaped bracket 182 (FIG. 2) which provides a bearing for an outer end portion of the shaft 176. The shaft 176 is connected to the coupling 218. Mounted on the boss 64 are two brushes 226, 222 having brass contacts 224, 226 spring urged respectively into contact with the bushes 194, 196. Leads (not shown) from the brushes 220, 222 lead to an electrical power source, thus to provide means for heating the applying blade 12..

When the illustrative apparatus is in operation the adhesive applying blade 12 is heated. The supply device 2 is heated, the shaft 26 is rotated and the gears engaging the gear portion 168 and the gear 72 are caused to rotate, so that the supply roll 6 rotates and the folding blade 50 and the adhesive applying blade 12 move in their paths as shown in FIG. 3. As the supply roll rotates molten adhesive composition fills the recesses 42 and, as the surface of the roll 6 passes the bar 46 all adhesive composition is wiped from the curved surface 8 of the roll 6.

The gears 144 and 170 are of such sizes that the supply roll 6 makes one revolution to three revolutions of the applying device 16 and the circular path B, FIG. 3, is approximately three times the circumference of the roll 6. It can be seen from FIG. 3 that as the applying device reaches a top center position the folding blade is retracted behind the adhesive applying blade 12. On further rotation of the roll 6 and device 10 the blade 12 approaches the roll 6 and enters one of the recesses 42 adjacent an entry edge 230 of the recess (see FIG. 4). The blade 12 has, at its point of contact, a velocity approximately nine times that of the surface of the roll 6, and the blade 12 thus moves through the recess, sweeping out a quantity of adhesive composition from the recess 42. It will be recalled that the blade 12 is spring loaded. It is so arranged that it does at least reach an exit edge 232 of the recess. It is possible to arrange for the blade to overrun the exit edge 232 of the recess and to contact part of the surface 8 of the roll 6. This is in no way detrimental.

At the exit edge 232 there is a boundary between adhesive composition in the recess 42 and the surface 8, which is clean of adhesive composition. The blade 12 as it passes over the edge 232 thus gathers up the adhesive composition collected in its passage through the recess 42 and takes it clearly off the roll 6. There is little if any tendency for the viscosity of the adhesive composition to drag such composition back onto the roll 6.

The quantity of adhesive gathered in any one revolution by the blade 12 may be regulated by adjustment of the relative timing of the blade 12 and the roll 6 by adjustment of the relative positions of the gear and the disc 174. If the blade 12 is arranged to enter the recess 42 substantially at the edge 230 the blade collects almost all the adhesive composition in the recess 42. If it is arranged to enter the recess at some point nearer the exit edge 232 it collects correspondingly less adhesive composition.

On further rotation of the applying device 10 the folding blade 50 tucks a bag blank 52 into the recess 56 of the roll 54 and the blade 12 then applies a line of molten adhesive composition to the blank 52. Further movement of the roll 54 causes the upstanding portion 58 of the blank 52 to be folded down onto the line of adhesive composition, thus to secure the bottom of the bag, in the usual manner.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of'the United States is:

1. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, com prising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recess on the supply roll and to remove adhesive from the recess for application to a work piece during continued revolution of the blade.

2. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, and drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll and to remove adhesive from each recess for application to a work piece during continued revolution of the blade.

3. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recess on the supply roll and to remove adhesive from the recess for application to a work piece during the continued revolution of the blade.

4. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and trans versely of the work piece and for yielding movement radially toward said axis, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recess on the supply roll, in succession, and to remove adhesive from each recess for application to a work piece during the continued revolution of the blade.

5. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, drive mechanism for rotating said supply roll and for revolving said blade in predetermined time in angular relations such that the blade is caused to enter said recess on the supply roll and to remove adhesive from the recess for application to a work piece during continued revolution of the blade, and means associated with the drive mechanism for altering the angular relation between said blade and said supply roll to varythe entry of the blade into the recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

6. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, and drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll, in succession, and to remove adhesive from each recess for application to a work piece during continued revolution of the blade, and means associated with the drive mechanism for altering the angular relation between said blade and said supply roll to vary the entry of the blade. into each recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

7. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recess on the supply roll and to remove adhesive from the recess for application to a work piece during the continued revolution of the blade, and means associated With the drive mechanism for altering the angular relation between said blade and said supply roll to vary the entry of the blade into the recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

8. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each Work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll, in succession, and to remove adhesive from each recess for application to a work piece during the continued revolution of the blade, and means associated with the drive mechanism for altering the angular relation between said blade and said supply roll to vary the entry of the blade into each recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

9. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, means for heating the blade, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time in angular relations such that the blade is caused to enter the recess on the supply roll and to remove adhesive from the recess for application to a work piece during continued revolution of the blade.

10. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, means for heating the blade, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, and drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll, in succession, and to remove adhesive from each recess for application to a work piece during continued revolution of the blade.

11. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, means for heating the blade, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter the recess on the supply roll and to remove adhesive from the recess for application to a work piece during the continued revolution of the blade.

12. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each Work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, means for heating the blade, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, a drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll, in succession, and to remove adhesive from each recess for application to a work piece during the continued revolution of the blade.

13. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, com prising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, means for heating the blade, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recess on the supply roll and to remove adhesive from the recess for application to a work piece during continued revolution of the blade, and means as sociated with the drive mechanism for altering the angular relation between said blade and said supply roll to vary the entry of the blade into the recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

14. Apparatus for applying adhesive to work pieces as they are fed along, sucessively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece, means for heating the blade, a supply r-oll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive receiving recesses equally spaced circumferentially around its periphery, and drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll, in succession, andto remove adhesive from each recess for application to a work piece during continued revolution of the blade, and means associated with the drive mechanism for altering the angular relation between said blade and said supply roll to vary the entry of the blade into each recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

15. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, means for heating the blade, a supply roll mounted for rotation about an axis spacedfrom and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with an axially extending arcuately shaped adhesive receiving recess, drive mechanism for rotating said supply roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recess on the supply roll and to remove adhesive from the recess for application to a work piece during the continued revolution of the blade, and means associated with the drive mechanism for altering the angular relation between said blade and said supply roll to vary the entry of the blade into the recess and thereby to vary the amount of adhesive removed therefrom and applied to the work piece.

16. Apparatus for applying adhesive to work pieces as they are fed along, successively, as a band extending transversely across a portion of each work piece, comprising an applying blade mounted-for revolution in a circular path about an axis extending parallel to and transversely of the work piece and for yielding movement radially toward said axis, means for heating the blade, a supply roll mounted for rotation about an axis spaced from and parallel to the axis of revolution of the applying blade, a casing associated with the supply roll and shaped to provide a chamber adjacent to said roll, means for supplying heated and molten adhesive to said chamber and hence to said roll, said supply roll being provided with a plurality of axially extending arcuately shaped adhesive 1 1 1 2 receiving recesses equally spaced circumferentially around References Cited by the Examiner its periphery, a drive mechanism for rotating said supply UNITED STATES PATENTS roll and for revolving said blade in predetermined time and angular relations such that the blade is caused to enter said recesses on the supply roll, in succession, and to 5 remove adhesive from each recess for application to a Work piece during the continued revolution of the blade, FOREIGN T and means associated with the drive mechanism for alter- 277,262 9/1927 Great ing the angular relation between said blade and said sup- 876,656 9/1961 Great Bntamply roll to vary the entry of the blade into each recess and 10 thereby to vary the amount of adhesive removed there- CHARLES WILLMUTH Emml'ler from and applied to the work piece. LEON G. MACHLIN, Assistant Examiner.

1,837,032 12/1931 Evans. 2,238,695 4/1941 Hallman 1l8-202 

1. APPARATUS FOR APPLYING ADHESIVE TO WORK PIECES AS THEY ARE FED ALONG, SUCCESSIVELY, AS A BAND EXTENDING TRANSVERSELY ACROSS A PORTION OF EACH WORK PIECE, COMPRISING AN APPLYING BLADE MOUNTED FOR REVOLUTION IN A CIRCULAR PATH ABOUT AN AXIS EXTENDING PARALLEL TO AND TRANSVERSELY OF THE WORK PIECE, A SUPPLY ROLL MOUNTED FOR ROTATION ABOUT AN AXIS SPACED FROM AND PARALLEL TO THE AXIS OF REVOLUTION OF THE APPLYING BLADE, A CASING ASSOCIATED WITH THE SPPLY ROLL AND SHAPED TO PROVIDE A CHAMBER ADJACENT TO SAID ROLL, MEANS FOR SUPPLYING ADHESIVE TO SAID CHAMBER AND HENCE TO SAID ROLL, SAID SUPPLY ROLL BEING PROVIDED WITH AN AXIALLY EXTENDING ARCUATELY SHAPED ADHESIVE RECEIVING RECESS, A DRIVE MECHANISM FOR ROTATING SAID SUPPLY ROLL AND FOR REVOLVING SAID BLADE IN PERDETERMINED TIME AND ANGULAR RELATIONS SUCH THAT THE BLADE IS CAUSED TO ENTER SAID RECESS ON THE SUPPLY ROLL AND TO REMOVE ADHESIVE FROM THE RECESS FOR APPLICATION TO A WORK PIECE DURING CONTINUED REVOLUTION OF THE BLADE. 